4GB DDR3-1333 (PC3-10600) RAM Memory Upgrade for the Compaq HP Presario CQ57-339WM (Genuine A-Tech Brand) 4GB DDR3-1333 (PC3-10600) RAM Memory Upgrade for the Compaq HP Presario CQ57-339WM 100% Genuine A-Tech Brand Memory 4GB DDR3-1333 PC3-10600 Non-ECC Unbuffered 204 Pin 1.5V CL=9 Memory Limited Lifetime Warranty High Quality Ram specifically designed for the Compaq HP Presario CQ57-339WM